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V-3=60/(t-1)
60/t -3=60/(t-1)
60/t +3 -60/(t-1)=0
60t-60+3t²-3-60t kreska ułamkowat(t-1)=0 /*t(t-1)
60t-60+3t²-3-60t=0
3t²-63=0 /:3
t²-21=0
Δ=81
√Δ=9
t=4,5
V=60/t
V=60/4,5
V=13 i 1/3 [km/h]